Publikation: Very small “window of opportunity” for generating CO oxidation-active Aun on TiO2
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2014
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Tang, X.
Luo, Y.
Wörz, Anke S.
Judai, K.
Abbet, S.
Kim, Y. D.
Fairbrother, D. H.
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Physical Chemistry Chemical Physics. 2014, 16(14), pp. 6735-6742. ISSN 1463-9076. eISSN 1463-9084. Available under: doi: 10.1039/C4CP00160E
Zusammenfassung
Recent research in heterogeneous catalysis, especially on size-selected model systems under UHV conditions and also in realistic catalytic environments, has proved that it is necessary to think in terms of the exact number of atoms when it comes to catalyst design. This is of utmost importance if the amount of noble metal, gold in particular, is to be reduced for practical reactions like CO oxidation. Here it is shown that on TiO2 only Au6 and Au7 clusters are active for CO oxidation which holds for the single crystal, thin films, and titania clusters deposited on HOPG. Size-selected cluster deposition and TPD methods have been employed to investigate the CO oxidation activity of Aun/TiO2 systems which are compared to recent results reported by Lee et al. to form a consistent picture in which only two species can be regarded as “active”. The efficiency of investigated Aun/(TiO2)93/HOPG composite materials is attributed to carbon-assisted oxygen spillover from gold to support particles and across grain boundaries.
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TANG, X., John SCHNEIDER, Andreas DOLLINGER, Y. LUO, Anke S. WÖRZ, K. JUDAI, S. ABBET, Y. D. KIM, Gerd GANTEFÖR, D. H. FAIRBROTHER, Ueli HEIZ, K. H. BOWEN, Sebastian PROCH, 2014. Very small “window of opportunity” for generating CO oxidation-active Aun on TiO2. In: Physical Chemistry Chemical Physics. 2014, 16(14), pp. 6735-6742. ISSN 1463-9076. eISSN 1463-9084. Available under: doi: 10.1039/C4CP00160EBibTex
@article{Tang2014small-29615,
year={2014},
doi={10.1039/C4CP00160E},
title={Very small “window of opportunity” for generating CO oxidation-active Au<sub>n</sub> on TiO<sub>2</sub>},
number={14},
volume={16},
issn={1463-9076},
journal={Physical Chemistry Chemical Physics},
pages={6735--6742},
author={Tang, X. and Schneider, John and Dollinger, Andreas and Luo, Y. and Wörz, Anke S. and Judai, K. and Abbet, S. and Kim, Y. D. and Ganteför, Gerd and Fairbrother, D. H. and Heiz, Ueli and Bowen, K. H. and Proch, Sebastian}
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<dcterms:abstract xml:lang="eng">Recent research in heterogeneous catalysis, especially on size-selected model systems under UHV conditions and also in realistic catalytic environments, has proved that it is necessary to think in terms of the exact number of atoms when it comes to catalyst design. This is of utmost importance if the amount of noble metal, gold in particular, is to be reduced for practical reactions like CO oxidation. Here it is shown that on TiO<sub>2</sub> only Au<sub>6</sub> and Au<sub>7</sub> clusters are active for CO oxidation which holds for the single crystal, thin films, and titania clusters deposited on HOPG. Size-selected cluster deposition and TPD methods have been employed to investigate the CO oxidation activity of Au<sub>n</sub>/TiO<sub>2</sub> systems which are compared to recent results reported by Lee et al. to form a consistent picture in which only two species can be regarded as “active”. The efficiency of investigated Au<sub>n</sub>/(TiO<sub>2</sub>)<sub>93</sub>/HOPG composite materials is attributed to carbon-assisted oxygen spillover from gold to support particles and across grain boundaries.</dcterms:abstract>
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